Disperse azo dyestuffs



dict

3,112,364 DFSPERSE All) DYESiTUFFS Gtto Senn, Arlesheirn, Basel-Laud, Switzerland, assignor to Sandoz Ltd. (also known as Sandoz A.G.), Basel,

Switzerland No Drawing. Filed Sept. Mi, 19613, Ser. No. 57,119

(Ilaims priority, application Switzerland Sept. 23, 1959 6 Claims. (Cl. 260-207) This invention relates to disperse dyestuffs of low water solubility which contain at least one monoor dinuclear aromatic acy-l radical, which radical itself contains at least one low molecular halogenalkyl group and is combined with the dyestulf radical through a nitrogen atom. N-acyl radicals of this type are cg. groups of the formula [(0112) nzlm 1TI g wherein x represents hydrogen or low molecular alkyl which may be substituted, y CG-- or SO;, 2: halogen, and n and m denote low integers, and wherein the nucleus A may contain further substituents.

The process for the production of the new disperse dyestuffs consists in condensing organic dyestuffs which contain at least one amino group with anexchangeable hydrogen atom, or onganic compounds which contain at least one amino group with an exchangeable hydrogen atom plus at least one substituent capable of dyestufi." formation, with a functional derivative of an aromatic monoor dinuclear acid which bea s at least one low molecular halogenoallcyl group, whereupon the reaction products formed, when they contain radicals of organic compounds capable of dyestuff formation, are converted into waterinsoluble dyestuffs by a suitable reaction, the reactants being so chosen that the final products are free from carboxylic acid and sulfonic acid groups.

A preferred mode of operation of the process is to carry out the condensation with aromatic acid halides of the formula wherein y denotes -CO- or SO z and w halogen, n and m low integers, and wherein the nucleus A may contain further substituents.

The new recess is applicable with several classes of organic disperse dyestuffs which are of low water solubility. Those of primary interest for the process contain at least one amino group; examples of these dyes are aminomonoazo, aminodisazo and aminonitro dyestuffs. The aminornonoazo and cminodisazo dyestuffs may contain metal atoms combined by coordination links, e.g. chromium, cobalt, nickel or copper atoms. Also, aminoazo dyestuffs which contain metallizable groupings can be reacted with a compound of the Formula ll. Dyestuffs of this latter type can either be metallized in substance after metallization or reacted with the fiber in the metalfree form and the dyeings aftertreated with metal-yielding agents.

As stated above, it is possible to arrive at disperse dyestuffs of low water solubility containing an aromatic acyl radical by starting from organic compounds which contain at least one amino group with an exchangeable hydrogen atom plus one substituent capable of dyestufi lormation. The azo coupling plays an important part in the reaction giving the final dyestuifs. It can be accomplished by reacting a compound containing at least one highly reactive amino group with an exchangeable hydrogen atom plus one diazotizable amino group of low reactivity With a functional derivative of an aromatic acid, conforming to the invention, diazotizing the intermediate product and coupling the diazo compound with a coupling component to give a disperse dyestutf of low water solubility, or again by reacting a compound containing at least one amino group with an exchangeable hydrogen atom plus a substi-tuent convertible into a diazotizable amino group with a functional derivative of an aromatic acid, con-forming to the invention converting the substituent in the intermediate into a diazotizable amino group, diazotizing the amino compound and cou-' pling the diazo compound with a coupling component to give a disperse dyest-uif of low Water solubility.

Compounds having at least one amino group with an exchangeable hydrogen atom plus a couplable carbon atom, e.g. aminohydroxy compounds, can be condensed with a functional derivative of an organic acid conforming to the invention to give an intermediate product for use as coupling component. Naturally the diazo compound of an aromatic acyl radical of the type defined in the foregoing can also be coupled with a coupling component which likewise contains a radical of this type.

The reaction of the compounds of sparingly watersoluble disperse dyestuffs used as starting products with a functional derivative of an aromatic acid can be conducted in aqueous suspension, in aqueous-organic suspension or solution, or in solution in an inert solvent. The functional derivative of the aromatic acid conforming to the invention can be employed as such in concentrated form or in solution in an organic solvent, suitable solvents being acetone, dioxane, benzene, chlorobenzene and toluene.

The reaction in aqueous-organic or aqueous medium is carried out in the weakly alkaline, neutral to weakly acid region, preferably at pH 7 to 3. The reaction ternperat-ure is adjusted to the reactivity of the starting products. To neutralize the halogen halide formed an acidbinding agent such as sodium acetate is added to the reaction solution or suspension at the start of the reaction, or alternatively small portions of sodium or potassium carbonate or bicarbonate in solid pulverized form or in concentrated aqueous solution are added in the course of the reaction. Other suitable neutralizing agents are aqueous solutions of sodium or potassium hydroxide. The addition of small amounts of a wetting or emulsifying agent to the reaction :medium can accelerate the rate of reaction.

On completion of condensation or coupling the final disperse dyestufi isolated according to one of the fundamental operations: filtration, evaporation of the solvent, precipitation from the solution with a suitable agent and filtration.

The disperse dyestuffs of low water solubility containing at least one group of Formula I are suitable for the dyeing, padding and printing of hydrophobic fibers and fiber blends, as well as shaped articles of these fibers, e. g. fibers or shaped articles of cellulose ethers and esters and of fully synthetic fibers such as linear polyesters, polyurethanes, polyacrylonitrile, acrylonitrile copolymers, and also mixtures of these fibers or articles, but preferably of synthetic polyamide fibers and of basically modified polyacrylonitrile fibers. The dyeings possess good fastmess to light, perspiration, washing, milling, sublimation, pleating, heat setting and sea water. Dyeings, paddings and prints of the said dyestuifs are subjected to heat treatment either during or after the application of the dyestuffs. In the three types of application the commonly used wetting, levelling, thickening and other textile auxiliary agents can be employed, while the heat treatment is carried out to best advantage in presence of agents which combine with hydrogen halide.

Suitable dispersing agents are the condensation products of naphthalene sulfonic acid and formaldehyde and of alkyl phenols and ethylene oxide, also the esters of sulfosuccinic acid, Turkey red oil, soaps and similar agents; these are employed in the presence or absence of protective colloids such as dextrins, British gum, and water-soluble proteins.

Secondary cellulose acetate is sensitive to temperatures above 90 C. and must be dyed at 60-85" 0, Whilst cellulose triacetate can be dyed at 95-100" C.

The fully synthetic fibers (linear aromatic polyesters, polyarnides, polyurethanes, polyacrylonitrile, polyvinyl chloride) can be dyed at 60-l00 C. At temperatures above 100 C. dyeing is carried out under pressure.

An alkaline aftertreatment is advisable for dyein-gs on polyamide fibers in order to improve the washing fastness.

The dyed fibers can be Washed with Warm water which may contain a synthetic detergent if necessary, and are then rinsed and dried. In certain cases the treatment can be carried out in one operation using an inorganic or organic base or an alkaline soap or an alkaline detergent.

The disperse dyestuffs of this invention are suitable for printing synthetic fibers with the aid of dispersing agents; for this purpose alkaline substances such as e.g. sodium bicarbonate are used. The print pastes are prepared with the normal additions such as urea, thiourea etc.

In the following examples the parts and percentages are by weight and the temperatures in degrees Centigrade.

EXAMPLE 1 22.7 parts of 2-hydroxy 5 methyl-4-aniino-l,1'-azobenzene are dissolved in 200 parts of dioxane and 200 parts of water. The yellow solution formed is cooled to and 23 parts of 4-chloro-methylbenzene-l-carboxylic acid chloride in 500 parts of acetone are gradually added with stirring. By simultaneous addition of sodium acetate a constant pH of 6 is obtained. Stirring is continued for 2 hours at 02, then the mass is diluted with 500 parts of water, the precipitated dyestufi filtered off and the presscake washed and carefully dried with vacuum at 40.

The new dyestuff, which is a yellow powder and can be recrystallized from glacial acetic acid (melting point 200), dyes synthetic polyamide fibers such as nylon and Perlon (registered trademark) from fine aqueous dispersion in yellow shades possessing good light and wet fastness. To improve the dyestutfs dispersibility it can be previously ground in the dry state with eg equal amounts of monosodium phosphate and sodium dinaphthylmethane sulfonate, or the presscake can be mixed with a suitable dispersing agent, the mixture ground in the wet state and the resulting paste carefully dried so as not to impair the enhanced dispersibility.

1 part of the dyeing prepartion thus obtained is dispersed in 20 parts of water and the dispersion added to 4000 parts of water containing 4 parts of a condensation product of ethylene oxide and a fatty alcohol. 100 parts of a nylon fabric are added, the dyebath heated to 95 and maintained at this temperature for 1 hour. The dyed fabric is removed, rinsed with water, treated for 1 hour at 100 in a solution of 0.1% soap and 0.1% sodium carbonate, rinsed again and dried. It is dyed yellow and possesses good light and washing fastness.

EXAMPLE 2 22.7 parts of Z-hydroxy methyl-4-amino1,1-azobenzene are dissolved in 300 parts of glacial acetic acid. 30 parts of anhydrous sodium acetate are added, followed at 80 by 23 parts of 4-chloromethylbenzene-1-carboxylic acid chloride. After a few hours the reaction product crystallizes out in the pure form and is separated by filtration. It is identical with the dyestuff obtained according to Example 1.

In the following table amino dyestuffs are listed in column 11 from which are derived the reactive disperse dyestuif conforming to the invention and containing a radical of the formula The amino groups which react with a functional derivative of the chlorornethylbenzene carboxylic acid are underlined. Column ill gives the shade of the dyeings and prints on synthetic polyamide fibers.

Dyestuifs having similar properties are obtained when the 4-chloromethylbenzene-l-carboxylic acid chloride used in the production or" the dyestuifs of Examples 1 to 12 is replaced by one of the following acid halides:

3chloromethylbenzene-l-carboxylic acid chloride,

3-bromomethylbenzene-l-carboxylic acid bromide,

4-bromornethylbenzene-l-carboxylic acid bromide,

3-chloro-4-chloromethylbenzene-l-carboxylic acid chloride,

3,5 dichloro 4-cl'dorornethylbenzene l-carboxylic acid chloride,

4-cl1loromethylbenzcne sulfonic acid chloride.

EXAMPLE 13 20.5 parts of 1-arnino-2-chloro-4-methylsulfonylbenzone are added at 1520 to nitrosylsulfuric acid produced with parts of concentrated sulfuric acid and 7 parts of sodium nitrite. The mass is stirred for 4 hours at 20, then run into a mixture of 350 parts of water and 600 parts of ice, and the small excess of nitrous acid destroyed with amidosulfonic acid. A solution of 32 parts of N ethyl N [2 (4"-chloromethylbenzenccarbonyl)-aminoethyl]-arnin0benzene in 15 parts of concentrated sulfunic acid, 50 parts of water and 15 parts of concentrated sulfuric acid, 50 parts of water and 15 parts of ice is added, upon which the dycstufl formed is precipitated. It is filtered off, washed neutral with water and dried at 40 with vacuum. It is obtained as an oran e-colouredpowder .which dyes polyamide fibers from aqeuous dispersion in orange shades fast to light and washing.

The same dyestuff is obtained when the aforenamcd diazo compound is coupled with N-ethyl-N-2-aminoethylaminobenzene and the intermediate product reacted with 4-chlorornethylbenzene carboxylic acid chloride.

N ethyl N [2-(4"-chl0romethylbenzcnecarbonyl)- aminoethyl1-aminobenzene can be produced in the following way: 16.4- parts of N-etnyl-N-T-aminoethylaminobenzene are dissolved in 400 parts of acetone at 20. 20 parts of 4-chloromethylbenzene carhoxylic acid chloride are added, the temperature increased to the boil with refiux, and an aqueous solution of 15 parts of crystallized 6 sodium acetate slowly dropped in. On completion of m and n are members selected from the group consisting acylation the acetone is distilled off at reduced pressure of hydrogen and chlorine, and the residue, an aqueous suspension, is either used r is a member selected from the group consisting of hyfor coupling after the addition of hydrochloric acid and droxy, chlorine and hydrogen, and ice or the acylation product is isolated from it in the nor- 5 p is a member selected from the group consisting of mernal way. thoxy and methylsulfonyl.

PRINTING METHOD '2. Dyestuff of the formula A printing paste is made with parts of a 715% 011 (H)b (001mm aqueous dispersion of dyesbuff No. 9 of the table, 41 parts of water, 2 parts of an aqueous solution of sul- 10 n fona'ted pine oil and sulfonated sperm oil, 1 part of so- I dium 3-nitrobenzene-l-sulfonate, 5 parts of a 5% sodium NH-(CO) --(SO2)1-r -CH2-Z alginate solution and 1 part of sodium bicarbonate. The I I paste is printed on a fabnic of secondary cellulose ace- OH: m tate, and the print dried, steamed 30 minutes, rinsed in wherein 5 water, soaped at 50 in a 0.2% soap solution, rinsed is an integer ofgrto 1, again, and dried' The Yellow P is fast to light and Z is halogen of atomic number from 17 to 35, inclusive, Washmgr b is an integer between 0 and 1, and

Formulae of representative dyes or the foregomg eX- m and n are members Selected from the group consisting amples are as follows: 20 of hydrogen and chlon-ne EXAMPLE 1 3. The disperse dye of the formula l i N=N -NH- O C -O-C H201 2 5 N=NNH O CC C H201 I I CH3 CH3 EXAMPLE 6 C2115 HaC-OzS-C -N=NN 4. The disperse dye of the formula EXAMPLE 10 V 1 E NH-CO-CH3 Disperse dye with the rest of the reactive system of N N NH OC 6-0mm t I column 4. NH-C 0CHa C 5. The disperse dye of formula I OH 01 01 N=N-NHO o-Gomct CH3 I Disperse dye with the rest of the reactive system of column 4.

or; O -O #33191 6. The disperse dye of formula l N=N- NH0 0- CH2C1 Having thus disclosed the invention what -I claim 1s:

1. Dyestulf of the formula References Cited in the file of this patent T It 1 r I N=N m I NHYO-CHzZ UNITED STATES PATENTS 2,864,816 Nicolaus et al Dec. 116, 1958 wherein FOREIGN PATENTS x is a member selected from the group consisting of hy- 565,443 Belgium Sept 6, 19,58 drogen, hydroxy, chlorine, acetylamino and methoxy, 963,457 Germany May 1957 Y e be ele ted fro th t'n f 26623,, 3,1 m B group comm g OTHER REFERENCES Z is a member selected from the group consisting of O1 Wegm ann, 1.: Textil-Praxis, October 1958, pages 1056- and -Br, 61. 

1. DYESTUFF OF THE FORMULA 